Here's the simplest and seemingly most correct explanation I've seen.

https://twitter.com/MBoffin/status/996562598815416321

Basically, the two sounds are overlaid with each other. If you have good hearing in high ranges, your mind will filter out one or the other, with a pretty strong bias to hear the higher pitched "Yanny". If your hearing is not so good, you're left only with the "Laurel" bit.

AsapScience is just totally wrong in their conclusion that the "Original" recording says "Laurel". Every bit of Laurel can be removed without altering the Yanny part and visa versa. They don't intersect.

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